At least one stray dog is killed every hour in the UK according to the animal charity Dogs Trust.
Almost 10,000 of the animals were put to sleep by local authorities because no one could find out who owned them, or new homes couldn't be found.
The research also found that more than 105,000 strays were picked up off the streets last year, which is about one dog for every 557 people in the UK.
The charity warns people considering getting a dog to think carefully.
"These figures are disturbing because of the sheer numbers of stray dogs being needlessly killed each year.
"Every dog should be a wanted dog," said Clarissa Baldwin, Dogs Trust Chief Executive.